Cutting device for use with concrete pavements



C. E. BLASS CUTTING DEVICE FOR USE WITH CONCRETE PAVEMENTS Filed Sept.21. 1928 INVENTOR ATTORNEYS Patented Apr. 21, 1 931 7 earn FFICE CLEMENTE. BLASS, 0F LAKEWOOD, OHIO, ASSIGNOR, BY MESNE'ASSIGNMENTS, TO THEJAEGER MACHINE COMPANY, OF COLUMBUS, OHIO, A

CORPORATION OF OHIO 'GUTTING DEVICE FOR USE W'ITI-I CONCRETE PAVEMENTSApplication filed September 21, 1928.

The present invention relates to a device which is intendedto be usedupon a freshly laid concrete pavement for the purpose of forming adepression longitudinally of the road and at the centerthereof, therebyforming a plane of weakness upon which plane the pavement will crack,thereby separating the'concrete slab into two slabs ducing the length ofbeam action which will occur over that which would exist if the concreteslab were not formed with the plane of weakness. V

Moreparticularly the invention relates to a device'which is mounted upona carriage having wheels at the extremity thereof, which wheels areadapted to cooperate with the side road forms usually employed in layingconcrete pavement, so that the device may be used and guidedlongitudinally of the concrete pavement.

The device may be formed as an attachment to be used in connection withpresent forms of concrete road finishing machines, in which event thedevice is maintained out of contact with the pavement during theoperation of the finishing machine, and after that machine hasaccomplished its work the finishing machine may be returned to itsinitial position, the screed or other implements normally working uponthe concrete so as to be out of use, and the device for forming theplane of cleavage depressed into proper contact with the freshly formedconcrete pavement and thefinishing machine moved forwardly over suchpavement while the device performs its function.

Reference should be had to the accompanying drawings forming a part ofthis specification, in which V Figure 1 shows a front elevation, withparts removed, of a concrete pavement finishing machine with the deviceforming the present invention as an attachment thereto.

Figure 2 is a. front elevation of the device forming the subject matterof this application.

Figure 3 is a side elevation of the showing in Figure 2.

Referring to Figure 1 of the drawings which indicates a truss (of whichthere are ,reference character 2.

and so reher 6 is a hand elevated,

Serial No. 307,398.

two or more) of a concrete pavement finishing machine. The machine ismounted upon wheels, two of which are indicated by the At 3 there isindicated a screed member, which in usual operation is moved toreciprocate transversely with respect to the pavement being laid.

The wheels 2 cooperate with the side forms 4.

All of the foregoing construction is well known in the art and needs noextended description. V

Mounted on the truss 1 and behind the screed 3 is a frame having sidemembers 5 and atone end an end member 6. I Intermediate the ends of theside member there is a transversely extending bracing member 7 The framemember may be mountedupon the truss in any desired manner, and for thepurpose there are shown bracket members 70,

8 which are attached to the truss in any desired manner. Mounted at thetop of the frame and specifically mounted in the memwheel 9. This wheelhas a hollow hub and extending into the hub and 5, through an opening inthe member 6 is the end of'a threaded member 11. The member 11 issecured in the hub of the member 9 by means of a cross pin 12. Themember 11 is provided with a collar, such asindicated at a 13, which isadapted to engage with the'under side of the member 6, so that when themember 11 is secured in the hub of the hand wheel 9 the lower'part ofthe member 6 is engaged bythe collar 13 while the upperpart of the amember 6 is engaged by the end of the hub of the hand wheel 9, therebydefinitelypositioning the hand wheel with respect to the frame 5 butpermitting turning movement of the hand wheel. 1 The threaded member 11cooperate's with an internal nut member 1 1, this nut member beingprovided with extensions 15 which are secured to a rod 16. This rod atits lower end has two members 17 and 18 secured thereto, the outer endsof which members are spread apart and at their outer ends are formedwithbosses 19 adapted to receive a transversely extending pin or shaft20, upon which there is mounted a wheel 21.

This W wheel is provided with outwardly extending hub portions 22, whichengage with the inner faces of the bosses 19. The wheel member 21 is,comparatively speaking, thin, and the periphery of the same may beformed as a V-shape, so as to more readily penetrate into the concretepavement.

The lower ends of the frame members 5 are formed each with reentrantgroove 28, into which the transversely extending pin or shaft 20extends. his cooperation between the pin 20 and the grooves 23 preventsany twisting movement of the wheel witn respect to the frame 5, butpermits the wheel member to be elevated or lowered by the rotation ofthe hand wh el 9.7

The rod 16 extends tirough a suitable opening formed in the transversebrace memher 7, thereby forming a guide and securing direct linearmovement of the wheel 21 when adjusted upwardly or dmvnwardly. Thedevice and speci"ca ly the wheel 21 is intended to be used in forming acentral longitudinal depression in a concrete pa ement after the samehas been finished and before it is hardened. This is accomplished byClQPI'eSS- ing the wheel 21, so that it cuts into the freshly laidconcrete to the desired depth. As the wheel is moved forwardly it willform a longitudinal groove in the pavement by depressing the aggregateupon each side of the wheel as it moves forward.

The groove will, after the passage of the wheel, more or less fill upwith the concrete mortar, and this is removed by a man WOFrI- ing withan edging tool, which man at the same time trims the edges of the groovewhich have been formed with the wheel, so as to give the edges a properradius. After the concrete has hardened this groove is filled with taror similar product to seal against the entrance of moisture. Where thedevice is used as an attachment for a finishing machine, the wheel maybe retained in its elevated position during such time as the finishingmachine is performing its finishing operations upon the concrete roadwaybeing laid.

After a stretch of pavement has been laid the finishing machine is movedback to its initial position, the various instrumentalilties on thefinishing machne for working upon the concrete pavement are elevated soto be inoperative and the wheel is lowered until it penetrates into theconcrete pavement to the extent desired. Then the finishing machinemoves forwardly, thus forming in the freshly laid concrete pavement acenter longitudinal groove, which, when the pavement hardens, will forma plane along which the pavement may cracir, so as to separate theinitial concrete slab into two slabs, and thereby reduce the beam actionfrom that of one long beam to that of two short beams.

While in the present application the disclosure has been made withrespect to the groove forming device as an attachment to a concrete roadfinishing machine, it will be understood that, where desired, thecutting wheel may be independently used by mounting it upon its owncarriage extending transversely of the road, which carriage is providedwith wheels to travel upon the side forms of the roadway or othersupports.

Having thus described my invention what I claim is:

An attachment to be used with road finishing machines comprisingvertical frame members adapted to be supported by the machine in spacedparallel relationship, said frame members each being provided adjacentits lower end with a vertically extending groove, a horizontal framemember connecting the upper ends of the vertical members, a threadedmember extending through said last named member and having threadedengagement with an adjustable supporting member arranged intermediatesaid vertical frame members, a yol-ze secured to the lower end of saidlast named member, a shaft supported in the outer enos of said yoke andeX- tending therebeyond with its ends arranged in the groove in saidvertical frame members, and a wheel rotatably mounted on said shaftintermediate the arms of said yoke.

In testimony whereof, Lhereunto aflix my signature.

CLEMENT E. BLASS.

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